From c54c2d16b9b36f4ace0bbc99904e2555cb4029e1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Anders=20B=C3=A4lter?= <anders@84codes.com>
Date: Tue, 14 Apr 2026 09:34:36 +0200
Subject: [PATCH] Generate en_US.UTF-8 locale in Ruby base image

Heroku apps migrated from slug to container deploys carry a
LANG=en_US.UTF-8 config var. On Debian slim this locale doesn't
exist, causing Ruby to silently fall back to US-ASCII encoding.
---
 ruby/Dockerfile | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/ruby/Dockerfile b/ruby/Dockerfile
index e826b23..7e3c908 100644
--- a/ruby/Dockerfile
+++ b/ruby/Dockerfile
@@ -12,8 +12,11 @@ RUN apt-get update -qq \
     git \
     libpq-dev \
     libyaml-dev \
+    locales \
     pkg-config \
     postgresql-client \
+    && sed -i '/en_US.UTF-8/s/^# //' /etc/locale.gen \
+    && locale-gen \
     && rm -rf /var/lib/apt/lists /var/cache/apt/archives
 
 # Non-root user for downstream runtime stages